Temperature Door Cable Adjustment; Master Switch And/Or Blower Switch; Vacuum Tank - Chevrolet Light Duty Truck 1978 Service Manual

K IC K P A D V A L V E
Fig. 1 B -3 4 --A ir In le t V a lv e s (C-K M o d e ls )
electrical harness at the control.
6. Remove the control.
7. If a new unit is being installed, transfer the master
blower switches to the new control.
8. To reinstall, reverse Steps 1-6 above. Check control
operation.
TEM PERATURE DOOR CABLE A D JU S TM E N T
1. Remove glove box and door assembly.
2. Loosen the cable attaching screw at the selector duct
assembly.
3. Make sure the cable is installed in the bracket on the
selector duct assembly.
4. Place temperature lever in full COLD position and
hold while tightening cable attaching screw.
MASTER S W ITC H A N D /O R BLOWER S W ITC H
The master switch is located on rear of the control
assembly.
Replacement
1. Disconnect the battery ground cable.
2. Remove the instrument panel bezel.
3. Remove the control to instrument panel screws and
allow control to rest on top of the radio.
4. Remove the switch to control screws, disconnect the
electrical harness (and vacuum harness on master switch)
at the switch and remove the switch assembly.
5. To install a new switch, reverse Steps 1-4 above.
V A C U U M TANK
The vacuum tank is mounted to the engine side of the
dash panel above the blower assembly (fig. IB-36).
Replacement
1. Disconnect the vacuum lines at the tank.
2. Remove the tank to dash panel screws and remove
the tank.
3. To install, reverse Steps 1 and 2 above.
BLOWER M OTOR RESISTOR
The blower motor resistor is located in the blower side
of the blower-evaporator case (fig. IB-37).
Replacement
1. Disconnect the wiring harness at the resistor.
2. Remove the resistor to case attaching screws and
remove the resistor.
3. Place the new resistor in position and install the
attaching screws.
4. Connect the resistor wiring harness.
BLOWER M OTOR RELAY
The blower motor relay is located on the blower side
of the blower-evaporator case (fig. 38).